Laser Welder PPT

1. Geometrical Interventions and Calibration
Advancements in Laser Welding Machine
for Enhanced PLTCM Production.
Akash Kumar
Uday Kumar
Niraj Kumar
CRM 3 Bokaro Steel Plant

2. Main characteristics
Type of weld Laser Butt weld
Type of laser CO² SLAB 8 kW
Weight approx. 150 t for the welder (64’’ machine)
Vertical clearance 150 mm
Pass line height 1200 mm (adaptable)
Strip flow either direction
Weld hole detection 20mm
Strip thickness # 30% of smaller thickness
(maximum 1mm)
Strip width # 900 to 1600 mm
Applications Pickling line, tandem mill for carbon steel
LW21H : Characteristics

3.  Perfect control of welding joint thickness
 No over thickness
 A controlled under thickness
 Yield increase (coil produced
according to customer requirements)
 Flexibility of Laser technology with new steels
 Very good results on thin material (until 0,5mm
thickness tested in SVAI Workshop)
 An innovative solution for fine cut shearing
operation
 Easy maintenance (access to components)
 Higher welding reliability (high performance shear)
LW 21 H : Advantages

4. Key Jobs Taken
1.laser beam alignment
2.Neutral fiber zeroing and clamp
leveling w.r.t the carriage.
3.Seam Calibration: establishment
of standard operating procedures
(SOP) for clamp traverse position
zeroing.

5. 1. laser beam alignment

6. 1 LASER Source
2 bendings mirror
1 welding head
Beam path

7. Bi Focal Mirror

8. Bending mirror Test Card
To check the Laser
Beam Spatial Position on
each Mirror

9. 2. Neutral fiber zeroing and
clamp leveling w.r.t the
carriage.

10. Vertical Level
Upper die
Lower die
Top surface Is always the reference
Mechanical stop
Adjustable
(neutral fiber)
Mechanical stop
fixed
Entry side Exit side

11. HR Strip reference
Mechanical stop
Adjustable
(neutral fiber)
Mechanical stop
fixed
Top surface of the Upper die is
the reference

12. Level Deviation of clamp w.r.t Carriage

13. Horizontal position Stopper for welding Position

14. Seam calibration

15. Seam calibration shoot

16. Weld tester
Ball test
Tensile test

17. PLTCM DELAY DUE TO LASER WELDER
Month Welding Delay (Hrs)
April 68:30
May 66:47
June 74:01
July 30:33
Aug
Sept
October
November
December

18. THANK YOU